WASHINGTON (AP) - A former top adviser to President Donald Trump's election campaign pleaded guilty Friday to federal conspiracy and false-statements charges in the special counsel's Russia investigation.

The plea by Rick Gates was a strong indication that he is planning to cooperate with special counsel Robert Mueller's investigation as it continues to probe the Trump campaign, Russian election interference and Gates' longtime business associate, Paul Manafort.

Gates, 45, of Richmond, Virginia, made the plea at the Federal Courthouse in Washington.

A court filing shows Gates admitted to charges accusing him of conspiring against the U.S. government related to fraud and unregistered foreign lobbying as well as lying to federal authorities in a recent interview.

Gates' plea came a day after a federal grand jury in Virginia returned a 32-count indictment against him and Manafort, Trump's former campaign chairman, accusing them of tax evasion and bank fraud.

The indictment in Virginia was the second round of charges against Gates and against Manafort, who has denied any wrongdoing. The two men were initially charged last October with unregistered lobbying and conspiring to launder millions of dollars they earned while working on behalf of a pro-Russian Ukrainian political party.

Gates' decision marks the fifth publicly known guilty plea in the special counsel probe into possible collusion between the Trump campaign and the Kremlin during the 2016 campaign.

The plea also comes quickly on the heels of the stunning indictment last week that laid out a broad operation of election meddling by Russia, which began in 2014, and employed fake social media accounts and on-the-ground politicking to promote Trump's campaign, disparage Hillary Clinton and sow division and discord widely among the U.S. electorate.

The charges to which Gates is pleading guilty don't involve any conduct connected to the Trump campaign. They largely relate to a conspiracy laid out in his indictments, but they do reveal that Gates is accused of lying to the FBI during an interview earlier this month.

The court papers accuse Gates of lying about a March 19, 2013, meeting involving Manafort, a lobbyist and a member of Congress. Gates said the meeting did not include discussion of Ukraine, when in fact prosecutors say it did.

The charges don't name the lobbyist or the lawmaker but filings with the Justice Department show Manafort and lobbyist Vin Weber of Mercury Public Affairs met with Rep. Dana Rohrabacher, R-Calif., on that date as part of an effort on behalf of Ukrainian interests.

Gates' lawyers filed a motion this month indicating they had reached "irreconcilable differences" with him. His new lawyer, veteran Washington white-collar attorney Thomas Green, formally took over Thursday. Green did not respond to a request for comment Friday.

As Gates was kept on house arrest, he frequently pleaded with U.S. District Court Judge Amy Berman Jackson for leniency to attend sporting events with his four children. His court filings gradually began to show the strain the case was placing on him and his family.

On Thursday night, Gates emailed a brief letter to friends and family, telling them of his decision to plead guilty, Republican lobbyist Jack Burkman said.

"It's sad," said Burkman, who had hosted a fundraiser for Gates' legal defense fund.

Also Friday, Gates asked a judge's permission to travel with his children to Boston for spring break so they could "learn about American history in general, and the Revolutionary War in particular."

Depending upon the terms of his plea agreement, Gates could become a key cooperator for Mueller with intimate knowledge of Manafort's years of political consulting work in Ukraine, as well as other events that have sparked the interest of federal investigators.

Gates had access at the highest levels of the campaign at the same time that Manafort, Donald Trump Jr. and Jared Kushner met with a team of Russians in Trump Tower in June 2016. He was also in the top ranks of the campaign when then-Sen. Jeff Sessions held a pair of undisclosed meetings with Russian ambassador to the U.S. Sergey Kislyak.

For a few months in 2016, Gates was indispensable to Trump, leading the ground effort to help Trump win the Republican nomination and flying from state to state to secure Republican delegates in a scramble that lasted all the way until the Republican National Convention in Cleveland.

But his power and influence waned once Trump fired Manafort in August 2016 after The Associated Press disclosed how Gates and Manafort covertly directed a Washington lobbying campaign on behalf of Ukrainian interests.

Gates survived his mentor's ouster and worked through the election on Trump's inaugural committee - but among Trump aides he earned the nickname "the walking dead." Gates also worked briefly with the outside political groups supporting Trump's agenda, America First Policies and America First Action, but was pushed out of that job last year.

Gates was working for Tom Barrack, a close friend of Trump's, when he was indicted last October.

___

Associated Press writers Eric Tucker contributed.

Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Interior Secretary Ryan Zinke, who is facing federal investigations into his travel, political activity and potential conflicts of interest, will leave the administration at year's end, President Donald Trump said Saturday.

Interior Secretary Ryan Zinke, who is facing federal investigations into his travel, political activity and potential conflicts of interest, will leave the administration at year's end, President Donald Trump said Saturday.

Special counsel Robert Mueller is set to give the first public insight into how much information President Donald Trump's former national security adviser Michael Flynn has shared with prosecutors in the Russia investigation.

Special counsel Robert Mueller is set to give the first public insight into how much information President Donald Trump's former national security adviser Michael Flynn has shared with prosecutors in the Russia investigation.

Michael Cohen, former personal attorney to President Donald Trump, exits federal court, November 29, 2018 in New York City.

Michael Cohen, former personal attorney to President Donald Trump, exits federal court, November 29, 2018 in New York City.

President Donald Trump's former lawyer, Michael Cohen, admitted Thursday he lied to Congress about a Moscow real estate deal he had pursued on Trump's behalf during the heat of the 2016 Republican campaign.

President Donald Trump's former lawyer, Michael Cohen, admitted Thursday he lied to Congress about a Moscow real estate deal he had pursued on Trump's behalf during the heat of the 2016 Republican campaign.